Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7f4bb8fa79892b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 20:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d9b47d4b0e05f2af74caaf0ce1b66ae SHA-1: 0c2f918e8b0d8448e4667d0da0d3df2e219146e1 SHA-256: 0b7f4bb8fa79892b8fc427dfe9c80e6cd42ac8d72fdaa0e33a4dbdad3f1b29c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many pointing to PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a malicious intent to distribute or redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://hram-uspeniya.ru/ckfinder/userfiles/files/99109101625.pdf In PDF document text
    • http://polipack.ru/content/file/najusipof.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/78021643752.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142384cbd6d0---gebufasatiboj.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rofujumuga.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/16591620891.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/jirabilil.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/41312550992.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/84801126077.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/40568261997.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/57873221211.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/70937013710.pdfIn PDF document text
    • http://topstec.com/d/files/kolizemuragezokujavuxif.pdfIn PDF document text
    • https://onlinendttraining.com/files/visono.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/zakukomisetojagomekado.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/milivezalegivojovuter.pdfIn PDF document text
    • https://teamcode.net/upload/files/sexuxekurowazelapat.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/demuliniwisibenop.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/72398082305.pdfIn PDF document text
    • https://terracell.info/images/file/43855486143.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/brn2cgn59iqdd2q70hdb9orlc4/47043321189.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xofijabewufek.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/93201374640.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631571064.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/5543613414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mario+kart+7+ds+rom+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 16252 bytes
SHA-256: 8ad6070c8027670d3eb8493bebfbbd63413dcde9d7a41867c46d60b6243d7e8b
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 10500 bytes
SHA-256: 9e171b718aed8f0aa79ba403a50d1691ff881d0d727ff9e3fdf7f25df0da16bc